california senator dianne feinstein says the murder of a dozen children changed the political environment. >> sandy hook, i think, really destroys all of the kind of tales that the nra is trying to weave about young people and guns. guns are positive things in the climate of america. >> reporter: feinstein of course was the author of the 199 assault weapons ban which was not renewed after it expired 10 years later, jamie. jamie: the one we've been hearing most about is the vice president who has been leading the administration's push for these new gun laws. what is he up to? >> reporter: biden is a former prosecutor. he is the author of violence against women act. he held a couple events last week including google plus hankout and roundtable at virginia commonwealth university. his criticism of assault weapons that they put police at disadvantage. cops find themselves outgunned. new york city police commissioner ray kelley said he would like an assault weapons ban but he said handguns is the big problem. >> we don't want them on the streets, make no mistake about it. but the problem is th